GE Range Error Code F4x

The F4x code on a GE range means the control board has detected an open circuit in the oven temperature sensor loop, with a measured resistance exceeding 4800 ohms. The sensor should normally read around 1080 ohms at room temperature. The oven cannot regulate heat safely without a valid sensor signal, so the control disables the heating system and displays this fault.

It is not recommended to operate the oven with an active F4x fault. The control board cannot monitor oven temperature without a functioning sensor signal, which means it cannot prevent the oven from overheating or underheating. Bake and broil functions should be considered unreliable until the sensor circuit is repaired.

Resetting the range by cycling the circuit breaker or unplugging it may temporarily clear the F4x code, but the fault will return as soon as the control board reads the sensor circuit again if the underlying problem has not been fixed. A reset is useful for confirming whether the fault is persistent, but it is not a repair. The sensor circuit must be properly diagnosed and the faulty component replaced to resolve the error permanently.

Many technicians and experienced DIYers can resolve this fault by testing and replacing the oven sensor, which is typically accessible from inside the oven cavity with basic hand tools. Start by disconnecting the sensor harness at the control board and measuring resistance with a multimeter. If the sensor reads well above 1080 ohms or shows an open circuit, replacing the sensor is a straightforward repair. If the sensor tests correctly, the fix requires closer inspection of the wiring harness and connector terminals.

If the oven sensor itself is the cause, the part typically costs between $20 and $60 depending on the model, and the repair is often something a homeowner can do without a service call. If a professional technician is needed, expect labor costs to bring the total repair into the $100 to $250 range. Control board replacement, if required, would cost significantly more, generally $150 to $400 or higher for parts alone.